Physics Exam Past Questions and Answers | JAMB, WAEC and NECO

Physics is the science that studies the nature and properties of matter and energy. It covers topics like motion, heat, light, sound, electricity, magnetism, and the structure of atoms.

• Question 931: A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the cell is Options:
  A) 12.0%
  B) 25.0%
  C) 33.3%
  D) 75.0%
  Show Answer
  The correct answer is D .
• Question 932: When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eye piece is 5.0cm. What is the distance between the lenses? Options:
  A) 10.0cm
  B) 30.0cm
  C) 45.0cm
  D) 55.0cm
  E) 250.0cm
  Show Answer
  The correct answer is D .
• Question 933: If the refractive index of glass is 1.5, what is the critical angle at the air-glass interface? Options:
  A) sin^-1$\frac{1}{2}$
  B) sin^-1$\frac{2}{3}$
  C) sin^-1$\frac{3}{4}$
  D) sin^-1$\frac{8}{9}$
  Show Answer
  The correct answer is B .
• Question 934: What is the uncertainty in the measurement of time, if the uncertainty in measuring the energy of an electron of mass 10^-30 kg is 2.45 × 10^-19J? h = 6.6 × 10^-34 Options:
  A) 1.35 ×10^-15s
  B) 2.69 × 10^-15s
  C) 4.15 × 10^-15s
  D) 9.05 × 10^-15s
  E) 1.62 × 10^-14s
  Show Answer
  The correct answer is B .
• Question 935: The maximum permissible current through a galvanometer G of internal resistance 10$\mathrm{\Omega }$ is 0.05A. A resistance R is used to convert G into a voltmeter with a maximum reading of 100V. Find the value of R and how it is connected to G Options:
  A) 20,000 ohms in parallel
  B) 19,990 ohms in series
  C) 1990 ohms in series
  D) 100 ohms in series
  Show Answer
  The correct answer is C .
• Question 936: Which of the following statements is true of a body which is moving in a straight line with uniform acceleration? The velocity of the body Options:
  A) is also uniform
  B) must always be zero when the body stops accelerating
  C) will increase with time in the direction of the acceleration
  D) is equal to the quotient of distance travelled and time
  E) is the product of the distance travelled and time
  Show Answer
  The correct answer is C .
• Question 937: A particle in circular motion performs 30 oscillation in 6 seconds. Its angular velocity is Options:
  A) 5 rad s^-1
  B) 6 rad s^-1
  C) 5π rad s^-1
  D) 10π rad s^-1
  Show Answer
  The correct answer is D .
• Question 938:

  Which expression gives magnetic flux?

  Options:
  A) qVB sin$\theta$
  B) $\frac{\mu \varphi I}{2\pi r}$
  C) BA cos $\theta$
  D) -N $\frac{d\varphi }{dt}$
  Show Answer
  The correct answer is C .
• Question 939: One of the features of the fission process is that Options:
  A) its products are not radioactive
  B) it leads to chain reaction
  C) neutrons are not released
  D) the sum of the masses of the reactants equals the sum of masses of the products
  Show Answer
  The correct answer is B .
• Question 940:

  A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is?

  [g = 10 ms^-2]

  Options:
  A) 600 J
  B) 150J
  C) 300 J
  D) 450 J
  Show Answer
  The correct answer is C .